Pair-Hopping Mechanism for Layered Superconductors

Details Pair-Hopping Mechanism for Layered Superconductors Pair-Hopping Mechanism for Layered Superconductors

2009-09-30

arxiv.org/abs/0909.5475v1

Physics

Condensed Matter

Superconductivity

24 pages, 2 figures, to be published in J. Phys. Soc. Jpn. (2009)

Scientific paper

We propose a possible charge fluctuation effect expected in layered superconducting materials. In the multireference density functional theory, relevant fluctuation channels for the Josephson coupling between superconducting layers include the interlayer pair hopping derived from the Coulomb repulsion. When interlayer single-electron tunneling processes are irrelevant in the Kohn-Sham electronic band structure calculation, the two-body effective interactions stabilize a superconducting phase. This state is also regarded as a valence-bond solid in a bulk electronic state. The hidden order parameters coexist with the superconducting order parameter when the charging effect of a layer is comparable to the pair hopping. Relevant materials structures favorable for the pair-hopping mechanism are discussed.

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